2 papers
astro-ph.SR2021
Magnetic properties on the boundary of an evolving pore
M. García-Rivas, J. Jurcak, N. Bello González
Context. Analyses of magnetic properties on umbrae boundaries led to the Jurcak criterion, which states that umbra-penumbra boundaries in stable sunspots are equally defined by a c…
astro-ph.SR2018
Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary
Markus Schmassmann, Rolf Schlichenmaier, Nazaret Bello González
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component averaged along the umbral boundary is found to be inde…